[HtmlUnit] JS HowTo

[<th...@cy...>]

Hi everybody, 

I don't understand the approach on testing JS with HtmlUnit. Should it
work transparently or do I have to execute JS-code explicit? 
For example I have select form element and a JS-function which will
click the submit-button belonging to the form, when an option in
mentioned select-element is choosed.
How is HtmlUnit with JS enabled supposed to behave? Should I simply get
a new page when changing the option in the select-element? (Ok, that
already didn't work ;) Or do I have to call the JS-functions by myself
using HtmlPage.executeJavaScriptIfPossible()?

BTW: The documentation of that method confused me a little bit. It says
in its signature, that it will return a ScriptResult, but it says in the
description below, that it will return a Page. I couldn't try it out
yet, but I'm curious what would gonna happen ;) 

kind regards
Thomas 
Berlin